Don't take it personal. Most of the tracks are governed by their insurance policies and have no control over the fact that you are not allowed to compete or even practice on their track. Track owners and operators love customers, and anyone that brings them $$$ is a plus, so if they could allow you chances are they would. Be calm, and professional about it. Leave a card or paper with your name, phone #, and the fact that you would like to be notified if you are able to ride/race there in the future. Accept the fact, and be prepared that this will be standard procedure for almost all the tracks you come across. Places that do allow trikes, or welcome them with open arms are rare gems. Treat them and appreciate them as such.